2645242805 has 4 divisors (see below), whose sum is σ = 3174291372. Its totient is φ = 2116194240.

The previous prime is 2645242793. The next prime is 2645242829. The reversal of 2645242805 is 5082425462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1086493444 + 1558749361 = 32962^2 + 39481^2 .

It is not a de Polignac number, because 2645242805 - 2⁸ = 2645242549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264524276 + ... + 264524285.

It is an arithmetic number, because the mean of its divisors is an integer number (793572843).

Almost surely, 2^2645242805 is an apocalyptic number.

It is an amenable number.

2645242805 is a deficient number, since it is larger than the sum of its proper divisors (529048567).

2645242805 is an equidigital number, since it uses as much as digits as its factorization.

2645242805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529048566.

The product of its (nonzero) digits is 153600, while the sum is 38.

The square root of 2645242805 is about 51431.9239869558. The cubic root of 2645242805 is about 1382.9989400604.

The spelling of 2645242805 in words is "two billion, six hundred forty-five million, two hundred forty-two thousand, eight hundred five".